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DIGITAL LIBRARY: CAMX 2023 | ATLANTA, GA | OCTOBER 30-NOVEMBER 2

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Constitutional Isomerism of Aryl Ether Ketone Diamine – Epoxy Networks

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Title: Constitutional Isomerism of Aryl Ether Ketone Diamine – Epoxy Networks

Authors: Andrew T. Hollcraft, Jeffrey S. Wiggins

DOI: 10.33599/nasampe/c.23.0143

Abstract: Matrices utilized for structural aerospace composites exhibit an inverse correlation of toughness and glass transition temperature leading to systemic microcracking of the matrix in high glass transition temperature thermosets. Historically toughening has been achieved through the incorporation of thermoplastic content, but these approaches ultimately limit processability due to increases in viscosity, solvent sensitivity, and cure path dependency. Plasticizers and flexible comonomers can also serve an analogous role, but often result in the reduction of modulus and glass transition temperature. The incorporation of network backbone segments resembling polyaryletherketones into thermoset matrices has found simultaneous improvements in both toughness and modulus. Although promising, the influence of isomerism has only been investigated in simpler network segments with significant modifications to glassy modulus, glass transition temperature, and solvent uptake behavior across a wide range of thermoset matrix chemistries. This research systematically modifies constitutional isomerism within the Aryl Ether Ketone (AEK) backbone of diamines utilized to produce epoxy-amine matrices of topological similarity differing only in aromatic ring connectivity, where tuneability of reactivity and thermomechanical behavior was achieved. These network segments are significantly larger than those previously investigated in literature and allow for a greater range of isomeric modulation to tailor glassy state storage modulus and glass transition temperature.

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Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000143

Pages: 8

Price: $16.00

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